通过带有 href 的 id 链接获取价值

Question

this is my input

<input type="text" name="quantity" id="quantity" value="1" />

this is my href link

<a href="UserOrderProduct.php?id=<?php echo $Pid; ?>
&price=<?php echo $Price; ?>&quantity=">add</a>

how to write it in the href and please ignore the

<?php echo $Pid; ?>&price=<?php echo $Price; ?>

this is because i get the id already from the database but only the quantity not really how to get it, can teach me?

Answer 1

If you have a form where you get the "quantity" value as it looks from your code:

<input type="text" name="quantity" id="quantity" value="1" />

if you use the "GET" method

<FORM method='get' action='next_script.php'>

all the values will be in the address, otherwise, if you POST the values you'll get them in the next script via $_POST array.

If you need to pass one or more couples variable=value between different scripts the best solution is to use PHP sessions.

You just need to add at the beginning of each script:

session_start();

and put your_variable and your_value as:

$_SESSION['your_variable'] = your_value;

or

$_SESSION['session_variable'] = $your_variable;

In such a way data are not visible on the link and you can access them anywhere you like provided that you keep the session_start() command at the beginning of each php page.

Answer 2

If you have html...

<form method="post" action="phpfile.php"> 
<input type="text" name="quantity" id="quantity" value="1" />
<input type="submit" value="send">
</form>

...in your phpfile.php you can retrieve the value of quantity like this:

<?php
$qty = $_POST['quantity'];
?>
<a href="UserOrderProduct.php?id=<?php echo $Pid; ?>
&price=<?php echo $Price; ?>&quantity=<?php echo $qty;?>">add</a>